Stage 1 PK-80 Top End Kit 80cc:
This Stage 1 Engine Kit provides turnkey performance for your PK-80 style motor. Buy the whole top end kit and get the original center fire Fred Head for free! ($10.00 extra for slant head). This american designed and manufactured cylinder head has many copycats trying to get a free ride from Fred's hard work. Buying from CR Machine will help keep an American machinist at work. Thank you! The cylinder body in this kit is fully and beautifully ported and polished for optimal flow and timing characteristics. PK-80 engines have either an copper colored unmarked connecting rod or the Z-L connecting rod.
- Your choice of cylinder head with coarse extra tall nuts. *see note below
- 1 Modified cylinder body with stock intake
- Stock intake manifold
- 1 Modified high-performance (Type-A) piston with rings
- 1 Wrist pin set
- 1 Aluminum top gasket
- 1 High quality bottom gasket
- NGK Spark plug
*For engines using a stock or mildly advanced exhaust system, the 5.0 or 5.5 cc head is a good choice, unless you plan to use race fuel. If you plan to run race fuel, then the 5.0 or 5.5 cc head will be excellent for highly advanced motors. For engines with an advanced exhaust system and using normal pump fuel, use the 6.0 or 7.0 cc head. There are other heads that can be substituted. Contact Fred and explain your engine configuration. The price will be higher for slant head or twin ignition head types.
In the drop down options, please let me know what type of exhaust system you plan to run with this cylinder. By letting me know this, I can tailor the port timing for optimal performance.
Coarse thread cylinder head nut torque spec: 60 inch pounds
Fine thread cylinder head nut torque spec: 48 inch pounds
- Before fitting the spark plug, gently rotate the engine to verify that the piston does not hit the cylinder head.